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This tautological name is explained by the fact that it has been corrupted from its original form, Tul Toinne, 'hillock of the wave'. The wave in question was the biblical flood, which, according to Lebor Gabála Érenn (commonly known as the Book of Invasions), drowned most of the members of the first invasion of Ireland, led by Cesair. Fionntán was the only member of the party who took refuge in this mountain. While the others were drowned in the deluge, he survived to tell the tale to later generations. Near the summit is a tomb known as the Graves of the Leinstermen. A legend associates this with a bloody dispute between some of Brian Boru's men and some visiting nobles from Leinster, but the tomb is actually prehistoric. A lower hillock to the N is called Knockaunreelyon (Cnocán Rí Laighean, 'hillock of the king of Leinster').
Tountinna is the 707th highest place in Ireland.Linkback: https://mountainviews.ie/summit/596/

As mentioned by jackill, it is possible to drive all the way to the summit of Toutinna which is what we did given the summit was covered in cloud. I would imagine the other option mentioned by jackill from the North side of the hill going up by the Graves of the Leinster Men would be a little bit more satisfying than driving all the way to the summit. Linkback: https://mountainviews.ie/summit/596/comment/20196/